2002MNRAS.331....1C

Query : 2002MNRAS.331....1C

2002MNRAS.331....1C - Mon. Not. R. Astron. Soc., 331, 1-6 (2002/March-3)

Detection of a cosmic microwave background decrement towards a cluster of mJy radio sources.

COTTER G., BUTTERY H.J., RAWLINGS S., CROFT S., HILL G.J., GAY P., DAS R., DRORY N., GRAINGE K., GRAINGER W.F., JONES M.E., POOLEY G.G. and SAUNDERS R.

Abstract (from CDS):

We present the results of radio, optical and near-infrared observations of the field of TOC J0233.3+3021, a cluster of milliJansky radio sources from the TexOx Cluster survey. In an observation of this field with the Ryle Telescope (RT) at 15GHz, we measure a decrement in the cosmic microwave background (CMB) of -675±95µJy on the RT's~0.65kλ baseline. Using optical and infrared imaging with the McDonald 2.7-m Smith Reflector, the Calar Alto 3.5-m telescope and the United Kingdom Infrared Telescope (UKIRT), we identify the host galaxies of five of the radio sources and measure magnitudes of R ~24, J ~20, K ~18.

The cosmic microwave background (CMB) decrement is consistent with the Sunyaev-Zel'dovich (SZ) effect of a massive cluster of galaxies, which if modelled as a spherical King profile of core radius θC=20arcsec has a central temperature decrement of 900µK. The magnitudes and colours of the galaxies are consistent with those of old ellipticals at z ∼1. We therefore conclude that TOC J0233.3+3021 is a massive, high redshift cluster. These observations add to the growing evidence for a significant population of massive clusters at high redshift, and demonstrate the effectiveness of combining searches for active galactic nuclei (AGN) `signposts' to clusters with the redshift-independence of the SZ effect.


Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): galaxies: active - galaxies: clusters: general - cosmic microwave background - cosmology: observations

Nomenclature: Fig.2: [CBR2002] A (Nos A-E). [CBR2002] JHHMMSS.ss+DDMMSS.ss N=8.

CDS comments: TOC J0233.3+3021 = ClG J0233+3021

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 [CBR2002] J023311.41+302507.91 Rad 02 33 11.41 +30 25 07.9           ~ 1 0
3 NVSS J023314+301937 rG 02 33 14.1 +30 19 40           ~ 1 0
4 ClG J0233+3021 ClG 02 33.3 +30 21           ~ 2 0
5 NVSS J023318+302238 rG 02 33 18.1 +30 22 40           ~ 1 0
6 [CBR2002] J023322.83+301924.11 Rad 02 33 22.83 +30 19 24.1           ~ 1 0
7 NVSS J023323+302156 rG 02 33 23.71 +30 22 01.2           ~ 2 1
8 NVSS J023324+302010 rG 02 33 25.0 +30 20 11           ~ 1 0
9 NVSS J023331+302233 rG 02 33 31.11 +30 22 33.6           ~ 3 1
10 [CBR2002] J023338.87+302110.41 Rad 02 33 38.87 +30 21 10.4           ~ 1 0
11 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 124 1
12 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2

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